Add layer description history

[paivagustavo]

This closes the issue #1179 adding the descriptions ('Classes', 'Dependencies', 'Resources' and 'Extra files') to the layer history.

Example:

e4f32e363ba1   45 minutes ago      Extra files created by jib-maven-plugin:0.9.14-SNAPSHOT    6B                  
<missing>           45 minutes ago      Classes created by jib-maven-plugin:0.9.14-SNAPSHOT        2.62kB              
<missing>           45 minutes ago      Resources created by jib-maven-plugin:0.9.14-SNAPSHOT      5B                  
<missing>           45 minutes ago      Dependencies created by jib-maven-plugin:0.9.14-SNAPSHOT   770B                
<missing>           48 years ago        bazel build ...                                            99.8MB              
<missing>           48 years ago        bazel build ...                                            1.93MB              
<missing>           48 years ago        bazel build ...                                            16.8MB              

[coollog]

Thanks for the contribution! @GoogleContainerTools/java-tools What do you think about having the layer type be the comment instead, so the created by still is the same as before?

[chanseokoh]

Adding the layer type looks good.

[TadCordle]

What do you think about having the layer type be the comment instead, so the created by still is as before?

+1

[paivagustavo]

Thanks for the contribution! @GoogleContainerTools/java-tools What do you think about having the layer type be the comment instead, so the created by still is the same as before?

I think this makes more sense too, I'll change this to work like that.

[loosebazooka]

Just to add to the comments in this PR, would prefer something like

IMAGE               CREATED             CREATED BY          SIZE                COMMENT
dcfe658ad0b2        48 years ago        jib-gradle-plugin   2.17kB              classes
<missing>           48 years ago        jib-gradle-plugin   1.54MB              dependencies

With minimal string processing on the comment value.

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[googlebot]

CLAs look good, thanks!

[paivagustavo]

Changed to add the layer type on the comments and without capitalizing it, so the updated example is:

IMAGE               CREATED             CREATED BY                         SIZE                COMMENT
cad97fa5d3a0        21 minutes ago      jib-maven-plugin:0.9.14-SNAPSHOT   6B                  extra files
<missing>           21 minutes ago      jib-maven-plugin:0.9.14-SNAPSHOT   2.62kB              classes
<missing>           21 minutes ago      jib-maven-plugin:0.9.14-SNAPSHOT   5B                  resources
<missing>           21 minutes ago      jib-maven-plugin:0.9.14-SNAPSHOT   770B                dependencies
<missing>           48 years ago        bazel build ...                    99.8MB              
<missing>           48 years ago        bazel build ...                    1.93MB              
<missing>           48 years ago        bazel build ...                    16.8MB              

[coollog]

Looks great! Would you mind adding entries to the CHANGELOG.md for jib-gradle-plugin and jib-maven-plugin?

[TadCordle]

Looks good, I think when the nits are fixed it should be good for approval/merging

[paivagustavo]

@coollog @TadCordle discussions were resolved and also added to the change log. I think it is fine now.

[chanseokoh]

Thanks for your contribution! I think we can get this merged soon.